import type { PublicContact } from '@/services/settings'
import { mailtoHref, telHref } from '@/services/settings'

export type SupportLinkKind =
  | 'whatsapp'
  | 'telegram'
  | 'instagram'
  | 'phone'
  | 'email'

export type SupportLinkItem = {
  kind: SupportLinkKind
  label: string
  href: string
  subtitle: string
}

function trimValue(value: string | null | undefined): string {
  return value?.trim() ?? ''
}

function isHttpUrl(value: string): boolean {
  return /^https?:\/\//i.test(value)
}

function whatsappHref(raw: string): string | undefined {
  if (!raw) return undefined
  if (isHttpUrl(raw)) return raw
  const digits = raw.replace(/[^\d]/g, '')
  if (!digits) return undefined
  return `https://wa.me/${digits}`
}

function telegramHref(raw: string): string | undefined {
  if (!raw) return undefined
  if (isHttpUrl(raw)) return raw
  const handle = raw.replace(/^@/, '').replace(/^https?:\/\/(t\.me|telegram\.me)\//i, '').trim()
  if (!handle) return undefined
  return `https://t.me/${handle}`
}

function instagramHref(raw: string): string | undefined {
  if (!raw) return undefined
  if (isHttpUrl(raw)) return raw
  const handle = raw.replace(/^@/, '').replace(/^instagram\.com\//i, '').trim()
  if (!handle) return undefined
  return `https://instagram.com/${handle}`
}

export function buildSupportLinks(contact: PublicContact | null): SupportLinkItem[] {
  if (!contact) return []

  const items: SupportLinkItem[] = []

  const wa = trimValue(contact.supportWhatsapp)
  const waHref = whatsappHref(wa)
  if (waHref) {
    items.push({ kind: 'whatsapp', label: 'واتساپ', href: waHref, subtitle: wa })
  }

  const tg = trimValue(contact.supportTelegram)
  const tgHref = telegramHref(tg)
  if (tgHref) {
    items.push({ kind: 'telegram', label: 'تلگرام', href: tgHref, subtitle: tg })
  }

  const ig = trimValue(contact.supportInstagram)
  const igHref = instagramHref(ig)
  if (igHref) {
    items.push({ kind: 'instagram', label: 'اینستاگرام', href: igHref, subtitle: ig })
  }

  const phone = trimValue(contact.supportPhone)
  const phoneHref = telHref(phone)
  if (phoneHref) {
    items.push({ kind: 'phone', label: 'تماس تلفنی', href: phoneHref, subtitle: phone })
  }

  const email = trimValue(contact.supportEmail)
  const emailHref = mailtoHref(email)
  if (emailHref) {
    items.push({ kind: 'email', label: 'ایمیل', href: emailHref, subtitle: email })
  }

  return items
}